They have to complete two marathons in the span of just 16 days.
She completed the feat by running two on Sunday.
Denny Fryman, 65, wants to finish 1,000 before he turns 70.
Adding a race or two at the end of your season can be fun, but you have to do it right.
Leo Lightner started running in his 50s and now competes in marathons and ultramarathons.
Her record-setting time came 10 years ago this month.
Cancellation comes after a runner died during last week's half-marathon.
Deena Kastor is ranked second.
Patrick Makau and Edna Kiplagat are at the top of the list.
Fast times are expected as a result.